One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,9,12)(7,8,11,10)(15,20)(17,19)(23,27)(26,28)(2,4)(5,7)(6,10)(8,12)(9,11)(13,14,18,16)(15,17,20,19)(22,25)(26,28)(1,2,3,4)(7,11)(8,10)(13,15,18,20)(14,19,16,17)(21,22)(23,26)(24,25)(27,28)(5,6)(7,8)(9,12)(10,11)(13,16,18,14)(15,17,20,19)(21,23)(22,26)(24,27)(25,28)(5,8)(6,11)(7,12)(9,10)(13,17)(14,15)(16,20)(18,19) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.